Alarm for mill-elevators



CARTER 81: M McCI-IESNEY.

LLLLLLLLLLLLLLLLLLLLL S.

atented June 24 1890' UNITED Y STATES PATENT CEEICE.

FREDERICK CARTER AND MARCUS MCCHESNEY, CF NORTH PLATTE, NEBRASKA.

ALARM Fou MILL-ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 430,921, dated .I une 24, 1890.

Application filed February 27, 1890. Serial No. 342|006. (No model.)

To all whom, t 'may concern.-

Be it known that we, FREDERICK CARTER and MARCUS MCCHESNEY, citizens of the United States of America, residing at North Platte, in the county of Lincoln and State of Nebraska, have invented certain new and useful Improvements in Mill-Elevators, being an alarm to indicate chokingin elevator-shafts and to prevent the same, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention pertains to certain new and useful improvements in grist-alarms, having for its object the provision of a noiseless alarm continuously operated by the endless con` veyer-belt when the latter is free from obstruction.

The invention" consists of a bob or short rod pivotally secured in a conveyer-casing, so that one end is acted upon by the buckets on the conveyer-belt, its projecting end being thereby moved up and down, substantially as hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a view in perspective of an elevator-casing, showing our invention and having parts broken away. Fig. 2 sectional view. y

Referring to the drawings, A designates a conveyer-casing, a an endless conveyerbelt, and a the buckets secured thereto.

B is a bob or short rod pivotally supported near one end by a transverse pin b, which is passed through eyes b' of a plate b2, secured to a sectional board b3, removably secured within and forming a portion of the elevatorcasing. Coincident apertures are formed in plate b2 and board b3, through which is projected the bob or rod B, so as to be free to move therein.

In practice the bob or rod is continuously operated bythe endless belt of buckets, which latter strike against the inner inclosed end thereof in their upward movement, causing the raising and lowering of the outer end of is an enlarged detail such bob, its inner end being lowered as soon as freed from contact with the bucket, it being the heavier of the two arms of the bob. When the conveyer becomes choked, causing the bucket-s to cease movement, the same will be indicated by the failure of the bob to move. In this manner it is readily ascertained that the grist has caused a stoppage, and the same can be at once remedied. It Will also be observed that this alarm is entirely noiselesst'. e., 4it serves its purpose by continuous up and down movement, which ceases when there is anything wrong-and hence the device is extremely simple, cheap, and durable, and not lia-ble to get out of order orbecome'deranged.

I/Ve claim as our inventionl. In combination with an elevator-casing and an endless belt of buckets, a bob or rod projected through said casing and normally occupying an inclined position, its inner end being' on the line of travel of said buckets, whereby a vibratory movement is imparted to said bob or rod by the passage of the buckets, substantially as set forth.

2. The combination, with an elevator-casing having an aperture and an endless belt of buckets, of a bob or rod pivotally secured in said aperture and having its inner end in proximity to said buckets, su bstantially as set forth.

3. .The combination, with an elevator-casing and an endless belt of buckets, of a sectional board secured in said casing and having an aperture, a plate secured to said board having opposite eyes, a bob or rod, and a pivotal pin projected through said eyes for piv` otally securing said bob or rod, substantially as set forth.

In testimony whereof we affix oursignatures in presence of two witnesses.

FREDERICK CARTER. MARCUS MCCHESNEY. Vitnesses:

WILLIAM B. RIssE, JOHN I-IAWLEY. 

